Screw.Unit(function() {
  describe('Logger', function() {
    var logger

		before(function() {
			logger = new Logger()
		})

		this.logged = function(message)
		{
			expect(document.getElementById('debug').innerHTML).to(equal, message)
		}

		this.not_logged = function(message)
		{
			expect(document.getElementById('debug').innerHTML).to_not(equal, message)
		}

		describe("when dealing with enabled/disabled states", function()
		{
			it("should be enabled by default", function()
			{
				expect(logger.is_enabled()).to(be_true)
				expect(logger.is_disabled()).to(be_false)
			})

			it("should disable itself if div#debug is not found", function()
			{
				// delete div#debug
				var debug_div = document.getElementById('debug')
				var parent    = debug_div.parentNode
				parent.removeChild(debug_div)

				var temp_logger = new Logger()
				temp_logger.debug("foo")

				expect(temp_logger.is_enabled()).to(be_false)

				// re-append div#debug
				var new_debug_div = document.createElement('div')
				new_debug_div.id = 'debug'
				parent.appendChild(new_debug_div)
			})

			describe("when disabled", function()
			{
				before(function() {
					logger.disable()
				})

				it("should be disabled", function()
				{
					expect(logger.is_disabled()).to(be_true)
				})

				it("should not be enabled", function()
				{
					expect(logger.is_enabled()).to(be_false)
				})
			})

			describe("when enabled", function()
			{
				before(function()
				{
					logger.enable()
				})

				it("should be enabled", function()
				{
					expect(logger.is_enabled()).to(be_true)
				})

				it("should not be disbled", function()
				{
					expect(logger.is_disabled()).to(be_false)
				})
			})
		})

		describe("when enabled", function()
		{
			it("should log a message as debug", function()
			{
				logger.debug("foo")
				logged("DEBUG: foo")
			})

			it("should log a message as error", function()
			{
				logger.error("foo")
				logged("ERROR: foo")
			})
		})

		describe("when disabled", function()
		{
			before(function()
			{
				logger.disable()
			})

			it("should not log a message as debug", function()
			{
				logger.debug("foo")
				not_logged("DEBUG: foo")
			})

			it("should not log a message as error", function()
			{
				logger.error("foo")
				not_logged("ERROR: foo")
			})
		})
	})
})